Phase separation as an instability of the Tomonaga-Luttinger liquid

Article

关键词: T-J MODEL;    CORRELATED ELECTRON-SYSTEMS;    DIMENSIONAL HUBBARD-MODEL;    CORRELATION EXPONENTS;    CONFORMAL-INVARIANCE;    HEISENBERG CHAIN;    2 DIMENSIONS;    FERMI GAS;    DIAGRAM;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.56.12840

来源: SCIE

【 摘 要 】

Asymptotic behavior of the Tomonaga-Luttinger liquid in the vicinity of the phase-separated region is investigated in the one-dimensional t-J model to study the universal property of the c = 1 conformal field theory with U(1) symmetry near the K --> infinity instability. By analogy to the spinless fermion, we argue that the compressibility behaves as kappa proportional to (J(c) - J)(-1), and that the Drude weight is constant and changes to zero discontinuously at the phase boundary. This speculation is confirmed by analyzing the finite-size effect from the result of the exact diagonalization.

【 授权许可】

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